Thermal energy transfer: Cooling

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Presentation transcript:

Thermal energy transfer: Cooling

These two objects have the same volume but different surface areas These two objects have the same volume but different surface areas. Which one will cool down more quickly and why?

The object with the larger surface area will cool down more quickly The object with the larger surface area will cool down more quickly. The larger surface area allows more heat energy to be transferred to its surroundings.

These two objects are in different surroundings These two objects are in different surroundings. Which one will cool down more quickly and why?

The object on the left will cool down more quickly because the temperature difference between it and its surrounding is greatest.

The spade on the left is made from plastic, whilst the spade on the right is made from metal. Which one will cool down more quickly and why?

The metal spade will cool down more quickly because it is a good thermal conductor. It can therefore also emit thermal energy more quickly to its surroundings.